A high- and medium-voltage gas-insulated switchgear device, the peculiarity of which resides in the fact that it comprises a casing which contains: at least an interruption unit having at least one fixed contact and one moving contact which can couple each other, and first actuation means which are operatively connected to the moving contact; at least a disconnection unit electrically connected to the interruption unit, having at least one fixed contact and one moving contact which can couple each other, and second actuation means which are operatively connected to the moving contact; and in that at least one of said actuation means comprises a motor with position control.